Wasn't sure if I should post this in the commuters forum or here. But, here's the deal.
I am building a new bike for doing delivery work. Mostly food. I live in Milwaukee; if you've ever been, you know we've got some of the worst roads there are. Riding hard and riding often, I am going to hit potholes. It is a bumpy, bumpy ride. I am going to run over crap. I'll probably hit my share of curbs. And I am going to hit more potholes, and run over more rough road than you can imagine.

So, what is the most durable, bulletproof fixed wheelset out there for under two hundred bucks?

Also, I've herad of thickslick and gatorskin; any opinions on the most impregnable tire choice possible?

EDIT: It should be noted, weight is not a factor at all. Durability is paramount. I'm not a light guy, and as a delivery guy I need to avoid flats (DELAYS) as much as humanly possible.

Pretty much any deep v rim with at least 32-36 spokes and sealed bearing hubs can take a thrashing. Maybe tubulars to reduce chances of snake bite flats unless you feel like going with wider profile tires. For under $200 you have plenty of options, try checking retrogression or velomine.